Electric lamp and discharge devices – With envelope – Having base and connector
Reexamination Certificate
1999-10-21
2001-09-04
Patel, Ashok (Department: 2879)
Electric lamp and discharge devices
With envelope
Having base and connector
C313S318030, C313S578000, C315S049000, C315S307000, C315S291000
Reexamination Certificate
active
06285119
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a lightbulb, and more particularly to one which has associated therewith increased efficiency and longer life when compared to existing incandescent lightbulbs.
BACKGROUND OF THE INVENTION
The efficacy, in terms of electrical efficiency, of an electrical luminary such as a lightbulb is obtained by dividing the total light output (lumens) by the power input (watts), thereby calculating the lumens per watt. As is well known, with conventional incandescent bulbs most of the energy input into a bulb ends up wasted as heat. In most cases the figure approximates 95% or greater. For this reason, a bulb that produces 720 lumens of light requires 60 watts, with a resulting efficacy of 12 lumens per watt. On the other hand, if none of the energy input into a bulb was lost as heat, then only one watt of electricity would produce a light output of 340 lumens!
There have been a number of attempts to solve the problem. For example, fluorescent bulbs have been developed as an alternative light source. However, some people do not care for the appearance of things when viewed in the light given off by these type of bulbs. Furthermore, many of the fluorescent lights which exist are incompatible with standard electrical light sockets. Those which are compatible and which are called compact fluorescent bulbs are often at least twenty times as costly as incandescent bulbs, and as such consumers have not found them to be a viable option. Yet another drawback associated with fluorescent bulbs is that they also contain phosphorus and mercury which raise environmental concerns.
Attempts have also been made to increase the life of incandescent lightbulbs, so that instead of the average life of 750 hours, a lightbulb may last over 1000 hours, with some being advertised as lasting up to 3000 hours. However, associated with lightbulbs which last longer is an increase in price. Still further, the efficacy of such lightbulbs is drastically reduced, since in order to obtain the same amount of light a higher power bulb using more electricity must be utilized.
Therefore it is apparent that the need exists for a simple, yet more efficacious electric lightbulb. It is also apparent that it would be even more desirable if such a lightbulb was also one having a life longer than that associated with such conventional bulbs.
SUMMARY OF THE INVENTION
In accordance with this invention, an electric lightbulb is provided which is more efficacious than standard lightbulbs. The lightbulb is comprised of a lamp and a cap. The lamp has a base with a bulb secured to the base. The base has connected thereto one end of a pair of lead wires, with the lead wires having their opposite ends connected to a filament. The filament is in contact with a gas. A portion of the pair of lead wires are encircled by glass, with the glass encircled by as well as having secured thereto a metallic disk. The cap contains electrical circuitry to reduce the voltage fed into the lamp.
The cap may either be of a screw-type for placement in a screw style electrical socket, or of bayonet-type for placement in a bayonet style electrical socket. The filament is a coiled coil, also being supported by a plurality of support wires, each of which support wires has one end in contact with the filament and another end in contact with the glass which encircles the lead wires.
In one embodiment of the invention, the glass comprises an inner stem and an outer stem. In this embodiment, the support wires are in contact with the inner stem, while the outer stem is secured to the base. The gas associated with this embodiment is a mixture of an inert gas and a halogen gas. More preferably, the gas is a mixture of xenon and bromine. Most preferably, the ratio of xenon to bromine is 98:2.
In another embodiment of the invention, the glass is an inner bulb secured to the base. The inner bulb contains a halogen gas. In this embodiment, the bulb encases the inner bulb and metallic disk. The bulb contains an inert gas, or alternatively contains air.
The cap comprises a housing having a switch to control the light output of the lamp. The base is secured within cap.
There is also disclosed a lightbulb having a lamp and a cap. The lamp has a base and a bulb secured to the base, the base having connected thereto one end of a pair of lead wires, with the lead wires having their opposite ends connected to a filament, with the filament being a coiled coil, and with the filament being in contact with a mixture of an inert gas and halogen gas. A portion of the pair of lead wires is encircled by glass. The filament is also supported by a plurality of support wires, each of which support wires has one end in contact with the filament and another end in contact with the glass which encircles the lead wires, with the glass comprising an inner stem and an outer stem, and the support wires being in contact with the inner stem, and with the outer stem being secured to the base. The glass is encircled by and has secured thereto a metallic disk. The cap contains electrical circuitry to reduce the voltage fed into the lamp.
The cap may be either a screw-type for placement in a screw style electrical socket, or a bayonet-type for placement in a bayonet style electrical socket.
There is also disclosed a lightbulb having a lamp and a cap. The lamp has a base with a bulb secured to the base, with the base having connected thereto one end of a pair of lead wires. The lead wires have their opposite ends connected to a filament, with the filament in contact with a gas. A portion of the pair of lead wires are encircled by glass, with the glass being an inner bulb containing a halogen gas. The inner bulb is secured to the base, and the glass is encircled by and has secured thereto a metallic disk, with the bulb encasing the inner bulb and the metallic disk. The bulb contains an inert gas or just air at a pressure of one atmosphere. The cap contains electrical circuitry to reduce the voltage fed into the lamp.
The primary objective of this invention is to provide an electric lightbulb that is significantly more efficacious than existing conventional incandescent lightbulbs.
Another objective is the providing of an improved electric lightbulb which not only enjoys a greater efficacy than standard lightbulbs, but also enjoys a longer life.
These and other objects and advantages of this invention will be apparent from the following description, the accompanying drawings and the appended claims.
REFERENCES:
patent: 4687963 (1987-08-01), Gagnon et al.
patent: 5008587 (1991-04-01), Bogris
patent: 5118985 (1992-06-01), Patton et al.
patent: 5218261 (1993-06-01), Start
Kremblas, Foster Phillips & Pollick
Patel Ashok
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